I make a wish, the next person grants the wish, but subverts it by making it turn out bad, then they make a wish of their own and so on.
Example: Poster A: "I wish I could read other people's thoughts."
Poster B: "Wish granted. You are now able to read people's thought, but you are quickly dismayed to realize that they all think your nose is off center, and that your jokes are stupid.
Wish granted. Alas, since your hands grew roots, you became unable to operate a keyboard, and so cannot post on DXP anymoreOH WAIT YOU ALREADY DELETED YOUR ACCOUNT YOU ASSPRICK
Wish granted. An alien race with technology that far surpasses ours invades earth and enslaves all humans. After a violent revolt staged by the Charismatic human leader, a man who goes by the name "AngryScorpio" is suppressed , the human race is decimated and gets exiled to other planets, a galaxy away. There is nothing left on earth to show for mankind's existence, except for a giant statue of Michael Jackson, left standing by the aliens for reasons unknown to man.
Wish granted. An army of cats amasses at your door steps, Siamese and Prussians alike they stand rigid on their back paws, await for you to lead to greater glory than the cat nation has ever seen. You do not wish to risk yourself, but under the pressure of thousands of paws, you lead them in a raid on the local fish and chips stores. The police arrives on the scene but they are unable to restrain your cute wittle kittens, and get skinned alive. Cats that have been doubtful of your leadership gather to your flag after The Great Fish n' Chips victory. You amass an army as great as any ever seen. It's paws crush the green grass of Britain, leaving the pastures barren, it's meows deafen the ears of mortal men. Marching north, soon you are able to bring Scotland to it's knees. The British government is willing to capitulate and give you and your cats the highlands as your fiefdom, along with a yearly supply of fish. Your general staff urges you to take the offer, but you, drunk of victory, refuse and march south. Your cat army knows victory after victory. You manage to conquer Europe, naming a city after city in your honor. Yet, every victory costs lives. After every battle your army grows thinner and more dispirited, but you being your arrogant self ignore that. Somewhere near the Indian border you are finally assassinated by your second in command, Mr. Wiggles.
Example:
Poster A: "I wish I could read other people's thoughts."
Poster B: "Wish granted. You are now able to read people's thought, but you are quickly dismayed to realize that they all think your nose is off center, and that your jokes are stupid.
I wish I had the ability to fly."
I wish I had a teleportation device.